[Specifications] The package contains 2x door handle alarm, the size is 6.5x3.7x1.5cm/2.56x1.46x0.59inch, it is made of high quality ABS, other electronic components material[Small and Portable] This door handle alarm is perfect for home and travel, suitable for door handles, bedroom doors, houses and apartments, hotel rooms and dorms[Easy to Install and Work] Our alarm is battery operated (requires 3 AAA batteries, not included), no wiring required,Simple operation, one key switch to control the doorbell or alarm, dual mode can be selected, no complicated operation procedure.[Super Loud Alarm] This door alarm has a 115dB super loud siren sound that can be noticeable, helps wake up/alert homeowners or tenants, helps deter intruders and possibly notify neighbors (at 600 feet (185M) ) can be heard outside)[Multi-purpose] With this alarm installed in your house, office, factory, when the doors and windows are opened by children or the theft, it will alarm you to check for safety. To stay at the hotel, you can install this anti-theft alarm on the door and window, it will protect you, upon checking out, take the alarm with you for next-time use.